Improvements to feature staging

This gets rid of the 'experimental' level, removes the non-staged_api
case (i.e. stability levels for out-of-tree crates), and lets the
staged_api attributes use 'unstable' and 'deprecated' lints.

This makes the transition period to the full feature staging design
a bit nicer.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstd/time/duration.rs b/src/libstd/time/duration.rs
index a651d927c14..162c3677168 100644
--- a/src/libstd/time/duration.rs
+++ b/src/libstd/time/duration.rs
@@ -10,7 +10,7 @@
 
 //! Temporal quantification
 
-#![experimental]
+#![unstable]
 
 use {fmt, i64};
 use ops::{Add, Sub, Mul, Div, Neg, FnOnce};